Improved water-door for furnaces



Y' To all'whom ,it may concern.'

.UNITED I dS'Tivrrzs PATENT Q'FFICE. r

Josera ROGERS, oF NASHUA, NEfWuA'MrsHIRm t 4 "iMPRovED vwA'rlaR-@DQ'ouFon- FURNACES. p.

" Specification forming part ot Letters Patet No. 48,446, dated June 27,186.5.

Nashua, in the county of Hillsborough and State of New Ham pshire,'haveinvented a new aud'useful Improvement inr Doors forFur-" vhaces; audIdohereby declare that the following is afullizclear,amlexactdescription. thereof, Vwhich will enableothersskilled in the art to make and use' the same, reference being`-'had ta the accompanying drawings, forming 'partof'.tliisspecitication, in whichl y Figure lis au external viewofmyiiivention;

Eig. 42, a horizontal section of the same, taken inthe line .fr w, Fig.1 Fig.'3, a vertical sec# i tion of the same', takenim the line y y,Fig. 2.

Similar letters of `reference indicate like parts.

' Furnace-doors are at present constructed 'of Y cast-iron shellorcaselined .or tilled with brick.- In ashort-timeA-a few Weeks onlythe iron,owinggto the-extreme heat of the furnace, will melt and the bricks willfallout, ren- 'dering'thedoors perfectly useless.

The objectofmyinvention is torenler a furnace-door invulnerable againstheat, or to protect it in such a mannerthat it will lasta comparativelylongperiod, and -tothis eudlcast the doors with tubesI within themsciarranged or disposedas to forma siuuou's water-passage, .throughwhichwater'isjkept 4constantly ruuning .v yhilethe furnace is inuse,.andjthe doors:

therebykept in comparatiyely' a coolstate. -A represents the sheelorgcase of a furnace- 'door of my invention. This shell or case is of vcast-*iron and scast around pipes B, (gas pipes or' tubes will answerthe purpose,)` and. said pipes or tubes are fitted 'in the mold, so thatthe door may belcast; around them. 1The pipesortubes are arranged soasto form a continnous sinuous passage within the door and extend over asgreat an area of itas possible,

(see Fig. 2;) and each end of the tubular passage prnjects through thedoor7 so that indiarubber or other fiexible tubes maybe attached tothem.

These doors may be litted between guides, so that they may be raised andlow'erediuthe usual way, or they may-be hung on hinges,tl/1`e y flexibletubes admitting of the openiugaul closing of th e doors without aifecting-the iiow of the water through the pipes,which is occasioned By thisarrangement it by static pressure. will be see-n that if a door shouldcrack tlie` tubes within thev latter would not be aected i by it5 aswould be the case werev thewater-pas-- sage madeV directly-'through orin ythe door or l casting without tubes.

t I claim as new anddes-ire to'seeure by'Let- .ters Patent--- y As auimproved article of manuihcture,.at` door' for furnaces provided withinternal tubes toform a. water-passage through themi sub.` stautially asand for the. purpose herein `serl forth.

. Y JOSEPH ROGERS. Witnesses: i

E'MUNROE, E. A. SMITH.

